Profile: Mastroianni was probably the best Twin that nobody had ever heard of in 2012, amassing 1.5 wins above replacement in only 186 plate appearances thanks to excellent baserunning and very good defense. And in case you didn't get the memo, he's now the likely starting centerfielder in the wake of the Denard Span trade. Mastroianni has no power, but he puts the ball on the ground, runs like hell, steals bases in bunches, and plays a very good centerfield. Remind you of anyone you've heard of? So he's not exactly the next Ben Revere, but he should be able to hold down center until Aaron Hicks proves ready. Fantasy-wise, Mastroianni could be a very sneaky late-round pickup for stolen bases, and maybe even runs if he leads off. (Yikes.) (Brandon Warne)

The Quick Opinion: Though the probable starting center fielder of the Twins has some flaws, his assets -- wheels and defense -- should keep him in the starting lineup long enough to provide fantasy value. If his batting average ends up being okay, he might even make some mixed league rosters.

Profile: Mastroianni entered 2013 with a legitimate shot to claim the starting centerfield job. What occurred henceforth can only be termed as a total disaster. He missed time in the spring with a hamstring injury, and then again after hitting a foul tip of his left ankle in late March. On Opening Day as he tried to loosen it up, he aggravated the injury once more. It ended up being a stress reaction, which placed him in a walking boot and eventually required surgery to repair a bone chip. Then, while on a rehab assignment, he hyperextended his right knee. In mid-August, the Twins activated, then optioned him to Triple-A Rochester. Mastroianni eventually returned to the big league club in late August, and sputtered down the stretch with a .179/.217/.214 slash line. At times after activation, Mastroianni's ankle would act up, though he'd be fine shortly thereafter. Ultimately, he had the fixation hardware removed from his ankle after the season, and was removed from the 40-man roster over the winter. Since he's never been outrighted before, he'll remain in the Twins organization and still have a chance to crack the opening day roster as a reserve. That's a far cry from being the possible opening day starter in center field however, which is what was said of him prior to the 2013 season. (Brandon Warne)

The Quick Opinion: The Twins removed Mastroianni from the 40-man roster over the winter. He'll remain in the organization, and still have a chance to crack the opening day roster as a reserve, but his future potential is greatly diminished from just one year ago.

Profile: Mastroianni has completely fallen off the radar after a decent little run in 2012 with the Twins that saw him play good defense, run a little bit and look the part of a very solid fourth outfielder. A stress fracture in his left ankle cost him virtually all of the next season, and when he played he was still hampered by it, and as a result predictably awful. Last we all saw of Darin was a 5-for-43 (.116) stretch this season between the Twins and his mothership Blue Jays before he was banished to Buffalo for the duration. Mastroianni has surfaced with the Phillies on a minor league pact, where he'll look to crack an outfield that on paper might be the worst in baseball. He's still facing an uphill battle. (Brandon Warne)

The Quick Opinion: At one time Mastroianni looked like a speedy fourth outfielder type. That was about 30 pounds ago for cretins like you and me. Move along.